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LT1020CS Datasheet(PDF) 6 Page - Linear Technology

Part # LT1020CS
Description  Micropower Regulator and Comparator
PDF  16 Pages
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Manufacturer  LINER [Linear Technology]
Direct Link  http://www.linear.com
Logo LINER - Linear Technology

LT1020CS Datasheet(HTML) 6 Page - Linear Technology

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6
LT1020
CC
HARA TERISTICS
A
TYPICALPERFOR
CE
PI FU CTIO S
Pins 1, 14: No internal connection.
Pin 2: Regulator Output. Main output, requires 10
µF
output capacitor. Can be shorted to VIN or ground without
damaging the device.
Pin 3: Input Supply. Bypass with 10
µF capacitor. Must
always be more positive than ground.
Pin 4: Reference. 2.5V can source or sink current. May be
shorted to ground or up to 5V. Voltages in excess of 5V can
damage the device.
Pin 5: Comparator PNP Output. Pull-up current source for
the comparator. May be connected to any voltage from VIN
to 36V more negative than VIN (operates below ground).
Short-circuit protected. For example, if VIN is 6V then pin
5 will operate to – 30V.
Pin 6: Comparator NPN Output. May be connected to any
voltage from ground to 36V more positive than ground
(operates above VIN). Short-circuit protected.
Pins 7, 8: Comparator Inputs. Operates from ground to
VIN – 1V. Comparator inputs will withstand 36V even with
VIN of 0V.
Pin 9: Ground.
Pin 10: Current Limit. Connecting this pin to ground
decreases the regulator current limit to 3mA minimum.
Leave open when not used.
Pin 11: Feedback. This is the feedback point of the regu-
lator. When operating, it is nominally at 2.5V. Optimum
source resistance is 200k to 500k. The feedback pin
should not be driven below ground or more positive than
5V.
Pin 12: Shutdown. Turns output off.
Pin 13: Dropout Detector. This pin acts like a current
source from VIN which turns on when the output transistor
goes into saturation. The magnitude of the current de-
pends on the magnitude of the output current and the
input/output voltage differential. Pin current ranges from
5
µA to about 300µA.
INPUT VOLTAGE (V)
1
0
1020 G17
3
5
7
5.5
5.0
4.5
4.0
3.5
3.0
2.5
2.0
0
24
6
8
RL = 500Ω
RL = 50Ω
NO LOAD
VOUT = 5V
Regulator Thermal Regulation
TIME (ms)
0
0.1
140
1020 G16
20 40
80
180
VIN = 15V
VOUT = 5V
60
0
–0.1
0
50
100 120
160
LT1020 Turn-On Characteristic



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